It was discovered that PyOpenSSL, a Python wrapper around the OpenSSL library, does not properly handle certificates with NULL characters in the Subject Alternative Name field. A remote attacker in the position to obtain a certificate for 'www.foo.org\0.example.com' from a CA that a SSL client trusts, could use this to spoof www.foo.org and conduct man-in-the-middle attacks between the PyOpenSSL-using client and the SSL server. For the oldstable distribution (squeeze), this problem has been fixed in version 0.10-1+squeeze1. For the stable distribution (wheezy), this problem has been fixed in version 0.13-2+deb7u1. For the unstable distribution (sid), this problem has been fixed in version 0.13-2.1. We recommend that you upgrade your pyopenssl packages.
It was discovered that PyOpenSSL, a Python wrapper around the OpenSSL library, does not properly handle certificates with NULL characters in the Subject Alternative Name field.
A remote attacker in the position to obtain a certificate for
'www.foo.org\0.example.com' from a CA that a SSL client trusts, could
use this to spoof www.foo.org
and conduct man-in-the-middle attacks
between the PyOpenSSL-using client and the SSL server.
For the oldstable distribution (squeeze), this problem has been fixed in version 0.10-1+squeeze1.
For the stable distribution (wheezy), this problem has been fixed in version 0.13-2+deb7u1.
For the unstable distribution (sid), this problem has been fixed in version 0.13-2.1.
We recommend that you upgrade your pyopenssl packages.
Vulmon